Never run out of propane again especially when grilling! Hook up the propane level gauge between the tank and fuel line hose of your grill patio heater or other appliance. Easy-to-read dial shows good low and refill levels. The propane level gauge works on grills with an output of up to 80 000 BTU per hour. The easy-read dial shows fuel levels. Works on grills with output up to 80 000 BTU per hour. Fits Type-1 connection appliances.